miks Posted July 27, 2014 Posted July 27, 2014 Howsit hubbers, My front and rear disks are rubbing in one spot per rotation.I have taken both rotars off and they are both unbent. I have also tried re-aligning the caliper multiple times but there is always rub in one spot. Any suggestions? I phoned one of my local bike shops thinking my rims could be the problem but they assured me the rims, even if untrue, won't affect the rotor running through the caliper. (is this true?) The brakes are: Tektro HDC300 hydraulic disc, 160mm rotors. I have tried searching the forums but cant find anything that helps me. If anyone knows how to fix this, or has any suggestions, please help!
lechatnoir Posted July 27, 2014 Posted July 27, 2014 I'm not expert on this, but it really seems as if the rotors is warped somehow... But you said it's not... perhaps warping it in that spot will sort the rubbing out? dunno... weird
Skylark Posted July 27, 2014 Posted July 27, 2014 Your discs/rotors have high spots, very common, if it's mild live with it because they are a fact of life, if they are enough to stop your wheel in the same place after 2 or 3 revolutions after spinning your wheels then straighten them. Do a search on the forum there are already a few in depth topics about sorting out rotors. miks 1
miks Posted July 27, 2014 Author Posted July 27, 2014 Your discs/rotors have high spots, very common, if it's mild live with it because they are a fact of life, if they are enough to stop your wheel in the same place after 2 or 3 revolutions after spinning your wheels then straighten them. Do a search on the forum there are already a few in depth topics about sorting out rotors. I will look into it, thanks for the advice!
PhilipV Posted July 27, 2014 Posted July 27, 2014 Find the spot where it rubs, and then bend it back so that it is straight again. A shifting spanner should do the trick.
porqui Posted July 27, 2014 Posted July 27, 2014 Have had the same - find high spot place thumbs on high spot other fingers on other side of disk and put light to mild pressure on thumbs and pull pinkie in opposite direction in other words bend it. Don't force it!!Did mine with rotor still on hub as high spot was on the outside. Skylark 1
Pulse Posted July 27, 2014 Posted July 27, 2014 Have had the same - find high spot place thumbs on high spot other fingers on other side of disk and put light to mild pressure on thumbs and pull pinkie in opposite direction in other words bend it. Don't force it!!Did mine with rotor still on hub as high spot was on the outside. Jip. Rather use gradual pressure and test-fit in between 'bending attempts', just to make sure you don't over bend, and completely **** the rotor
Skylark Posted July 27, 2014 Posted July 27, 2014 I stay away from shifting spanners when bending rotors, too much force, fingers are better, a light tap on the high spot with a small copper hammer also works. Whatever you do, do it slowly and mildly, very easy to make the rotor a wavy mess. nickelass 1
Spoke101 Posted July 27, 2014 Posted July 27, 2014 If you say the rotor is completely flat, then it might not be totally symmetrical? as in it's rubbing on the middle of the spring that separates the pads. So this: Could rub on this: Johan Bornman 1
GreatGusto Posted July 27, 2014 Posted July 27, 2014 If you want to assess a rotor properly, you need a wheel truing rig or some other way of turning the wheel where you can measure with a dial gauge, dial gauge and small micrometer. Anything else is guess work. Use dial gauge to check for bent disk and micrometer to check for thickness variation. http://www.longislandindicator.com/Resources/s1.jpeg http://www.ffx.co.uk/Content/images/tools/MIT102701.jpg
Pulse Posted July 28, 2014 Posted July 28, 2014 Spending way more on measuring devices than what the rotors cost?I'd say go with guess work.. If you mess up the rotors, then raplace them.
miks Posted July 28, 2014 Author Posted July 28, 2014 I've watched the rotor run through the caliper it definitely rubs against the pad on one side per rotation. I'll take it off tonight and check again that its not warped in any way. If all else fails, I'll take my bike to my LBS and see what they can do. At least then I know that someone with proper tools is checking it out.
porqui Posted July 28, 2014 Posted July 28, 2014 Don't take it off - just find the high spot and bend with your hands - might want to put on some gloves. JXV 1
Pulse Posted July 28, 2014 Posted July 28, 2014 Don't take it off - just find the high spot and bend with your hands - might want to put on some gloves. Agree
King_Crispy Posted July 28, 2014 Posted July 28, 2014 If you want to assess a rotor properly, you need a wheel truing rig or some other way of turning the wheel where you can measure with a dial gauge, dial gauge and small micrometer. Anything else is guess work. Use dial gauge to check for bent disk and micrometer to check for thickness variation. http://www.longislandindicator.com/Resources/s1.jpeg http://www.ffx.co.uk/Content/images/tools/MIT102701.jpgWhat a load of ***.Trust your eyes and your ears.Look to see where the high-spot is, or listen to hear where it binds.You dont need to go to varsity to get a bsc to be clever, just be smart miks and Pulse 2
GreatGusto Posted July 28, 2014 Posted July 28, 2014 You stick to your methods and I'll stick to mine. GLuvsMtb 1
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